Articles | Volume 10, issue 14
Atmos. Chem. Phys., 10, 6777–6791, 2010
https://doi.org/10.5194/acp-10-6777-2010
Atmos. Chem. Phys., 10, 6777–6791, 2010
https://doi.org/10.5194/acp-10-6777-2010

  23 Jul 2010

23 Jul 2010

Lagrangian mixing in an axisymmetric hurricane model

B. Rutherford1, G. Dangelmayr1, J. Persing1, M. Kirby1, and M. T. Montgomery2 B. Rutherford et al.
  • 1Department of Mathematics, Colorado State University, Fort Collins, CO 80523-1874, USA
  • 2Department of Meteorology, Naval Postgraduate School, Monterey, CA 93943-5114, USA

Abstract. This paper discusses the extension of established Lagrangian mixing measures to make them applicable to data extracted from a 2-D axisymmetric hurricane simulation. Because of the non-steady and unbounded characteristics of the simulation, the previous measures are extended to a moving frame approach to create time-dependent mixing rates that are dependent upon the initial time of particle integration, and are computed for nonlocal regions. The global measures of mixing derived from finite-time Lyapunov exponents, relative dispersion, and a measured mixing rate are applied to distinct regions representing different characteristic feautures within the model. It is shown that these time-dependent mixing rates exhibit correlations with maximal tangential winds during a quasi-steady state, establishing a connection between mixing and hurricane intensity.

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